I was impressed with the battery life on the S compared to the straightforward Desire, but in the last week I've noticed significant deterioration. My type of use hasn't changed. I've not downloaded any apps recently. It normally shows about 50% at the end of a day, giving me about 5 hrs display per charge, t now it needs charging before I go to bed (as opposed to while I'm asleep). Could it be that battery needs calibrating? Should I remove battery? its not been taken out for 6 months. Do I have malware? Unfortunately Gingerbread doesn't allow Spare Parts battery history function , so I can't delve into whether or not this is an app issue. I don't use task killers, they're counter productive. Can a free app which checks battery history be recommended? Thanks.